diff --git a/aclocal.m4 b/aclocal.m4
index 46a95e4490..5e83ac5ba2 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -13,6 +13,7 @@
 
 m4_include([build/aclocal/ac_raf_func_which_getservbyname_r.m4])
 m4_include([build/aclocal/atomic_builtins.m4])
+m4_include([build/aclocal/ax_cflags_gcc_option.m4])
 m4_include([build/aclocal/ax_func_which_gethostbyname_r.m4])
 m4_include([build/aclocal/bakefile-dllar.m4])
 m4_include([build/aclocal/bakefile-lang.m4])
diff --git a/build/aclocal/ax_cflags_gcc_option.m4 b/build/aclocal/ax_cflags_gcc_option.m4
new file mode 100644
index 0000000000..b595a842a2
--- /dev/null
+++ b/build/aclocal/ax_cflags_gcc_option.m4
@@ -0,0 +1,223 @@
+# ===========================================================================
+#          http://autoconf-archive.cryp.to/ax_cflags_gcc_option.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
+#
+# DESCRIPTION
+#
+#   AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
+#   "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the optionflag
+#   to CFLAGS if it is understood. You can override the shellvar-default of
+#   CFLAGS of course. The order of arguments stems from the explicit macros
+#   like AX_CFLAGS_WARN_ALL.
+#
+#   The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add to
+#   CXXFLAGS - and it uses the autoconf setup for C++ instead of C (since it
+#   is possible to use different compilers for C and C++).
+#
+#   The macro is a lot simpler than any special AX_CFLAGS_* macro (or
+#   ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
+#   However, if you use this macro in a few places, it would be great if you
+#   would make up a new function-macro and submit it to the ac-archive.
+#
+#     - $1 option-to-check-for : required ("-option" as non-value)
+#     - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
+#     - $3 action-if-found : add value to shellvariable
+#     - $4 action-if-not-found : nothing
+#
+#   Note: in earlier versions, $1-$2 were swapped. We try to detect the
+#   situation and accept a $2=~/-/ as being the old option-to-check-for.
+#
+#   There are other variants that emerged from the original macro variant
+#   which did just test an option to be possibly added. However, some
+#   compilers accept an option silently, or possibly for just another option
+#   that was not intended. Therefore, we have to do a generic test for a
+#   compiler family. For gcc we check "-pedantic" being accepted which is
+#   also understood by compilers who just want to be compatible with gcc
+#   even when not being made from gcc sources.
+#
+#   See also: AX_CFLAGS_SUN_OPTION, AX_CFLAGS_HPUX_OPTION,
+#   AX_CFLAGS_AIX_OPTION, and AX_CFLAGS_IRIX_OPTION.
+#
+# LAST MODIFICATION
+#
+#   2008-04-12
+#
+# COPYLEFT
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#
+#   This program is free software; you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation; either version 2 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Macro Archive. When you make and
+#   distribute a modified version of the Autoconf Macro, you may extend this
+#   special exception to the GPL to apply to your modified version as well.
+
+AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
+   "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])
+
+
+dnl the only difference - the LANG selection... and the default FLAGS
+
+AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic -Werror % m4_ifval($2,$2,-option)"  dnl   GCC
+   "-pedantic % m4_ifval($2,$2,-option) %% no, obsolete"  dnl new GCC
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])
+
+dnl -------------------------------------------------------------------------
+
+AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
+   "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
+                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])
+
+
+dnl the only difference - the LANG selection... and the default FLAGS
+
+AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
+AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic -Werror % m4_ifval($1,$1,-option)"  dnl   GCC
+   "-pedantic % m4_ifval($1,$1,-option) %% no, obsolete"  dnl new GCC
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
+                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])
+
+AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])
+
+AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
+[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])
diff --git a/configure b/configure
index 8f0298fb05..34b371ea14 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Id: configure.in 56671 2008-11-03 21:55:03Z VZ .
+# From configure.in Id: configure.in 56747 2008-11-12 15:31:44Z VZ .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for wxWidgets 2.9.0.
 #
@@ -2646,7 +2646,6 @@ DEFAULT_DEFAULT_wxUSE_X11=0
 DEFAULT_DEFAULT_wxUSE_DFB=0
 
 PROGRAM_EXT=
-SO_SUFFIX=so
 SAMPLES_RPATH_FLAG=
 SAMPLES_RPATH_POSTLINK=
 
@@ -2657,7 +2656,6 @@ case "${host}" in
     USE_HPUX=1
     DEFAULT_DEFAULT_wxUSE_MOTIF=1
     NEEDS_D_REENTRANT_FOR_R_FUNCS=1
-    SO_SUFFIX=sl
     cat >>confdefs.h <<\_ACEOF
 #define __HPUX__ 1
 _ACEOF
@@ -2829,7 +2827,6 @@ _ACEOF
     USE_AIX=1
     USE_SYSV=1
     USE_SVR4=1
-                        SO_SUFFIX=a
     cat >>confdefs.h <<\_ACEOF
 #define __AIX__ 1
 _ACEOF
@@ -2856,8 +2853,7 @@ _ACEOF
   ;;
 
   *-*-cygwin* | *-*-mingw32* )
-                SO_SUFFIX=dll
-    PROGRAM_EXT=".exe"
+                PROGRAM_EXT=".exe"
     DEFAULT_DEFAULT_wxUSE_MSW=1
   ;;
 
@@ -2907,7 +2903,6 @@ _ACEOF
   *-*-darwin* )
         USE_BSD=1
     USE_DARWIN=1
-    SO_SUFFIX=dylib
     cat >>confdefs.h <<\_ACEOF
 #define __BSD__ 1
 _ACEOF
@@ -2926,7 +2921,6 @@ _ACEOF
   powerpc-apple-macos* )
         USE_UNIX=0
             ac_cv_c_bigendian=yes
-    SO_SUFFIX=shlib
             DEFAULT_DEFAULT_wxUSE_OSX_CARBON=1
     DEFAULT_STD_FLAG=no
   ;;
@@ -23274,6 +23268,8 @@ _ACEOF
 fi
 
 fi
+
+LARGEFILE_CPPFLAGS=
 # Check whether --enable-largefile was given.
 if test "${enable_largefile+set}" = set; then
   enableval=$enable_largefile;
@@ -23428,25 +23424,29 @@ _ACEOF
 echo "${ECHO_T}$wx_largefile" >&6; }
 fi
 
+if test "$ac_cv_sys_file_offset_bits" = "64"; then
+    LARGEFILE_CPPFLAGS="-D_FILE_OFFSET_BITS=64"
+elif test "$ac_cv_sys_large_files" = 1; then
+    LARGEFILE_CPPFLAGS="-D_LARGE_FILES"
+fi
 
-if test "x$wx_largefile" = "xyes"; then
-    if test "x$ac_cv_sys_file_offset_bits" = "x64"; then
-        WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES"
+if test -n "$LARGEFILE_CPPFLAGS"; then
+    WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS $LARGEFILE_CPPFLAGS"
 
-                                                        if test "$USE_HPUX" = 1 -a "$GXX" = "yes"; then
-            { echo "$as_me:$LINENO: checking if -D__STDC_EXT__ is required" >&5
+                            if test "$USE_HPUX" = 1 -a "$GXX" = "yes"; then
+        { echo "$as_me:$LINENO: checking if -D__STDC_EXT__ is required" >&5
 echo $ECHO_N "checking if -D__STDC_EXT__ is required... $ECHO_C" >&6; }
 if test "${wx_cv_STDC_EXT_required+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
 
-                    ac_ext=cpp
+                ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
-                    cat >conftest.$ac_ext <<_ACEOF
+                cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
@@ -23457,9 +23457,9 @@ int
 main ()
 {
 
-                            #ifndef __STDC_EXT__
-                                choke me
-                            #endif
+                        #ifndef __STDC_EXT__
+                            choke me
+                        #endif
 
   ;
   return 0;
@@ -23492,7 +23492,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 fi
 
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-                    ac_ext=c
+                ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
@@ -23503,14 +23503,21 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 fi
 { echo "$as_me:$LINENO: result: $wx_cv_STDC_EXT_required" >&5
 echo "${ECHO_T}$wx_cv_STDC_EXT_required" >&6; }
-            if test "x$wx_cv_STDC_EXT_required" = "xyes"; then
-                WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -D__STDC_EXT__"
-            fi
+        if test "x$wx_cv_STDC_EXT_required" = "xyes"; then
+            WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -D__STDC_EXT__"
         fi
-    else
-        WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS -D_LARGE_FILES"
     fi
-        { echo "$as_me:$LINENO: checking for _LARGEFILE_SOURCE value needed for large files" >&5
+fi
+
+ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+old_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS $LARGEFILE_CPPFLAGS"
+{ echo "$as_me:$LINENO: checking for _LARGEFILE_SOURCE value needed for large files" >&5
 echo $ECHO_N "checking for _LARGEFILE_SOURCE value needed for large files... $ECHO_C" >&6; }
 if test "${ac_cv_sys_largefile_source+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -23547,7 +23554,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -23593,7 +23600,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -23634,9 +23641,15 @@ _ACEOF
 
 fi
 
-    if test "$ac_cv_sys_largefile_source" != no; then
-        WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS -D_LARGEFILE_SOURCE=$ac_cv_sys_largefile_source"
-    fi
+CPPFLAGS="$old_CPPFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+if test "$ac_cv_sys_largefile_source" != no; then
+    WXCONFIG_CPPFLAGS="$WXCONFIG_CPPFLAGS -D_LARGEFILE_SOURCE=$ac_cv_sys_largefile_source"
 fi
 
 { echo "$as_me:$LINENO: checking whether byte ordering is bigendian" >&5
@@ -42913,7 +42926,7 @@ _ACEOF
   fi
 fi
 
-if test "$wxUSE_XLOCALE" == "yes" ; then
+if test "$wxUSE_XLOCALE" = "yes" ; then
     cat >>confdefs.h <<\_ACEOF
 #define wxUSE_XLOCALE 1
 _ACEOF
@@ -46746,7 +46759,96 @@ fi
 if test "x$INTELCXX" = "xyes" ; then
                                                             CXXWARNINGS="-Wall -wd279,383,444,810,869,981,1418,1419"
 elif test "$GXX" = yes ; then
-        CXXWARNINGS="-Wall -Wundef -Wunused-parameter -Wno-ctor-dtor-privacy"
+    CXXWARNINGS="-Wall -Wundef -Wunused-parameter -Wno-ctor-dtor-privacy"
+    { echo "$as_me:$LINENO: checking CXXWARNINGS for gcc -Woverloaded-virtual" >&5
+echo $ECHO_N "checking CXXWARNINGS for gcc -Woverloaded-virtual... $ECHO_C" >&6; }
+if test "${ac_cv_cxxflags_gcc_option__Woverloaded_virtual+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_cxxflags_gcc_option__Woverloaded_virtual="no, unknown"
+
+ ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+ ac_save_CXXFLAGS="$CXXFLAGS"
+for ac_arg in "-pedantic -Werror % -Woverloaded-virtual"     "-pedantic % -Woverloaded-virtual %% no, obsolete"     #
+do CXXFLAGS="$ac_save_CXXFLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_cxx_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  ac_cv_cxxflags_gcc_option__Woverloaded_virtual=`echo $ac_arg | sed -e 's,.*% *,,'` ; break
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+done
+ CXXFLAGS="$ac_save_CXXFLAGS"
+ ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_cxxflags_gcc_option__Woverloaded_virtual" >&5
+echo "${ECHO_T}$ac_cv_cxxflags_gcc_option__Woverloaded_virtual" >&6; }
+case ".$ac_cv_cxxflags_gcc_option__Woverloaded_virtual" in
+     .ok|.ok,*)  ;;
+   .|.no|.no,*)  ;;
+   *)
+   if echo " $CXXWARNINGS " | grep " $ac_cv_cxxflags_gcc_option__Woverloaded_virtual " 2>&1 >/dev/null
+   then { (echo "$as_me:$LINENO: : CXXWARNINGS does contain \$ac_cv_cxxflags_gcc_option__Woverloaded_virtual") >&5
+  (: CXXWARNINGS does contain $ac_cv_cxxflags_gcc_option__Woverloaded_virtual) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }
+   else { (echo "$as_me:$LINENO: : CXXWARNINGS=\"\$CXXWARNINGS \$ac_cv_cxxflags_gcc_option__Woverloaded_virtual\"") >&5
+  (: CXXWARNINGS="$CXXWARNINGS $ac_cv_cxxflags_gcc_option__Woverloaded_virtual") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }
+                      CXXWARNINGS="$CXXWARNINGS $ac_cv_cxxflags_gcc_option__Woverloaded_virtual"
+   fi
+ ;;
+esac
+
 fi
 
 
@@ -47711,6 +47813,8 @@ fi
     dlldir="$libdir"
 
     case "${BAKEFILE_HOST}" in
+                        ia64-hp-hpux* )
+        ;;
         *-hp-hpux* )
             SO_SUFFIX="sl"
             SO_SUFFIX_MODULE="sl"
diff --git a/configure.in b/configure.in
index 349bf3ff29..fc1357f7ac 100644
--- a/configure.in
+++ b/configure.in
@@ -7434,8 +7434,8 @@ if test "x$INTELCXX" = "xyes" ; then
     dnl     remark #1419: external declaration in primary source file
     CXXWARNINGS="-Wall -wd279,383,444,810,869,981,1418,1419"
 elif test "$GXX" = yes ; then
-    dnl CXXWARNINGS="-Wall -W -Wcast-qual -Werror"
     CXXWARNINGS="-Wall -Wundef -Wunused-parameter -Wno-ctor-dtor-privacy"
+    AX_CXXFLAGS_GCC_OPTION(-Woverloaded-virtual, CXXWARNINGS)
 fi